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Abstract

In a magnetic tape unit having vacuum column buffers which isolate a centrally located, low-inertia capstan from two variable-inertia tape reels and their high-inertia DC motors, means are provided for servo controlling both the reel motor's armature and its field, in order to maintain the reels under control without excessive length vacuum columns and without excessive reel motor power.

Country

United States

Language

English (United States)

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Field and Armature Control in a Reel Motor Servomechanism

In a magnetic tape unit having vacuum column buffers which isolate a
centrally located, low-inertia capstan from two variable-inertia tape reels and their
high-inertia DC motors, means are provided for servo controlling both the reel
motor's armature and its field, in order to maintain the reels under control without
excessive length vacuum columns and without excessive reel motor power.

Tape motion in the tape unit of the figure is under primary control of capstan 10. The latter initiates tape movement and disturbs the position of loops 11 and
12 in columns 13 and 14, respectively. As a result of loop movement, the
armatures of DC reel motors 15 and 16, receive servo commands to rotate reels
17 and 18 in a direction to reposition the loops. Control of tape motion is
provided by conductors 19 and 20. Capstan servo 21 is controlled by the motion
commands to energize capstan motor 22 so as to provide the required direction
of rotation, and to maintain the rotational speed of motor 22 at a predetermined
steady state value.

On the figure only the servo structure for motor 15 is shown, it being
recognized that an identical structure is provided for motor 16.

The motion commands are also supplied to control motors 15 and 16, by way
of conductors 23 and 24. Armature servo 25 responds to the capstan start
command and the capstan direction command and is effective to energize the
armature of motor 15, so as to cause the latter to begin rotating to move tape in
the direction of capstan tape motion. Servo 25 also receives input information by
way of conductor 26 as to the condition of loop 11 sensed by tape loop sensor 27. Servo 25 maintains an optimum length loop within column 13, in accordance
with the direction of capstan 10.